Decay of 133Nd and structure of 133Pr.

Abstract

The ${\ensuremath{\beta}}^{+}$-EC decay of mass-separated $^{133}\mathrm{Nd}$ (${T}_{1/2}$=70 sec) is studied by gamma-ray and internal conversion electron spectroscopy (${e}^{\mathrm{\ensuremath{-}}}$ and \ensuremath{\gamma} singles, \ensuremath{\gamma}-\ensuremath{\gamma}-t and ${e}^{\mathrm{\ensuremath{-}}}$-\ensuremath{\gamma}-t coincidences). Twenty new levels are proposed in $^{133}\mathrm{Pr}$ up to an excitation energy of 2.06 MeV. The new level scheme includes a ground state which differs from previous assignments. The low-energy excitation structure of $^{133}\mathrm{Pr}$ is compared with predictions of interacting boson-fermion model calculations.